/*
 * Copyright 2002-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.jdbc.support.incrementer;

import javax.sql.DataSource;

import org.springframework.util.Assert;

/**
 * Abstract base class for {@link DataFieldMaxValueIncrementer} implementations that use
 * a column in a custom sequence table. Subclasses need to provide the specific handling
 * of that table in their {@link #getNextKey()} implementation.
 *
 * @author Juergen Hoeller
 * @since 2.5.3
 */
public abstract class AbstractColumnMaxValueIncrementer extends AbstractDataFieldMaxValueIncrementer {

    /**
     * The name of the column for this sequence.
     */
    private String columnName;

    /**
     * The number of keys buffered in a cache.
     */
    private int cacheSize = 1;


    /**
     * Default constructor for bean property style usage.
     *
     * @see #setDataSource
     * @see #setIncrementerName
     * @see #setColumnName
     */
    public AbstractColumnMaxValueIncrementer() {
    }

    /**
     * Convenience constructor.
     *
     * @param dataSource      the DataSource to use
     * @param incrementerName the name of the sequence/table to use
     * @param columnName      the name of the column in the sequence table to use
     */
    public AbstractColumnMaxValueIncrementer(DataSource dataSource, String incrementerName, String columnName) {
        super(dataSource, incrementerName);
        Assert.notNull(columnName, "Column name must not be null");
        this.columnName = columnName;
    }


    /**
     * Set the name of the column in the sequence table.
     */
    public void setColumnName(String columnName) {
        this.columnName = columnName;
    }

    /**
     * Return the name of the column in the sequence table.
     */
    public String getColumnName() {
        return this.columnName;
    }

    /**
     * Set the number of buffered keys.
     */
    public void setCacheSize(int cacheSize) {
        this.cacheSize = cacheSize;
    }

    /**
     * Return the number of buffered keys.
     */
    public int getCacheSize() {
        return this.cacheSize;
    }

    @Override
    public void afterPropertiesSet() {
        super.afterPropertiesSet();
        if (this.columnName == null) {
            throw new IllegalArgumentException("Property 'columnName' is required");
        }
    }

}
